Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ca86c52c2d092a…

MALICIOUS

PDF

72.0 KB Created: 2021-10-02 20:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: beb889e15e0f34f314d1c4d24085073b SHA-1: 887f55205bd15077e6cc12db58e4ba6a74b93897 SHA-256: 05ca86c52c2d092a277a1d4b9dafd47c4e03cbca4c890bddaa18db92c46b28e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=ectopic+pregnancy+urine+test PDF link annotation
    • https://callmarkinvestments.fortunekenya.com/callmark/files/46079078698.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/biwedenajuxixoxaxiwetune.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/55228375325.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/bepetepijat.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9447c1ed7ce82fa19177a3b8d5019764/xakibiligotazepuf.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210907031357.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/10984834970.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/20299795731.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/47493558692.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/labajom.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/sovutipi.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/70562022358.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/31775503012.pdfIn PDF document text
    • https://truyenskyt.com/upload/ckeditor/files/tejagidetuwaxusitasa.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/99370984211.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdfd44c3e4---24208133781.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8f1e9712e350ecf1b50a21f1accb3cd7/lanudemalepu.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109301219503431.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/ferafenuri.pdfIn PDF document text
    • https://termoformat.md/img/files/31161298159.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/gugobaxawagosojiziliwu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d61707857ea08bc13080a5e00f9fe8bb/22889897644.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/48199298646.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/7925648386.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391e9f8ccf2---xiruzojigite.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/25048385847.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a411153b0e7ba779bb58694fb42514a0/befefesiremeza.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nm3hf6e5p9vmiqmafdqd87b356/41564381301.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 10700 bytes
SHA-256: 33332a7fabe091c54c8100b7bf18fc79168be77900cf53f879dcc5a4b7335bb7
font_01_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 16848 bytes
SHA-256: 659870cdeb69f2cac7420299568b7311ce0abdd1296f238b9210bf27567d9abd
font_02_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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